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The Empire State Building's observation deck located on the 102 floor has an elevation of 1250 above ground level. The elevation of the base of the ESB is 40 feet above mean sea level. This places the ESB observation deck at 1290 feet above mean sea level.

The original World Trade Center had a roof top observation deck at an elevation of 1362 feet above the ground. The base of the Twin Towers had an elevation of 10 feet above mean sea level. This...